Charles Spurgeon Commentary Deuteronomy 29:8-9

"and we took their land, and gave it for an inheritance unto the Reubenites, and to the Gadites, and to the half-tribe of the Manassites. Keep therefore the words of this covenant, and do them, that ye may prosper in all that ye do." — Deuteronomy 29:8-9 (ASV)

This, then, was the covenant made with the nation, that God should be their God and he would prosper them: as he had done, so would he do: he would be their protector, defender, strength, and crown and joy.